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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31765cf78606aec70670c78357b38934887c4ffcdf1a7d9972c7c77258c0512' 
  AND token = '1eFq8I/D4C6tsMDdw6jQxrBDmLqZMuGP/m8OT7alNbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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