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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a6b0d1b27550cc080354080c0042a876df6050ad8d9467a45878b74357f55e' 
  AND token = 'q7+Qd1YmWDGLcMFemh83tfpe8f42MIhPZezQDW9VKKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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