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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88be6b62151489d273b7e560f25d4d0566ab352fbc68f268bd6e38ef887f527b' 
  AND token = 'bB1a81UkrAqqmTmvxeTIz/Yg+NOkRbNQpS8dVE4nFG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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