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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a988998264cdc18e45905e12d1cf20a1fe12f8973c40d94f963c8f16d0fe3e1f' 
  AND token = '7kuFNYmP4ONuGXsTGmiLLx6PDB4iswMoPYl0tzoT+TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}