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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e9303d1216f20745f83e0c19c5ed02998cad05704986e75847025aa9f2c088' 
  AND token = 'mJXbeNVe5yThPTRK6M7a4hoJmQfYZfZ2Xk0Ca1G9NXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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