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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4ea856bf1be4c03c7a7f2c79ed4f76a06538d9065077c0d4ff0cfaf532e972' 
  AND token = 'G81HHwTTioJ6T6ETSmWFq4lnl3z0SKtwZ5G0EJRrOBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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