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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0b380df238544c23aa3026fd02f5d23d25237836abc29dcd8c519e1aa63471' 
  AND token = 'fdd75KYK9a0rGZwtNsIc2us9ghqg67Y7qFycDqbERLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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