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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7525cddd06477e31b075dbf827f1c1ede0b1fa8a28ad43454b108fc07691fd1a' 
  AND token = 'W4i6pOOPKRU3Y9T+X/92PqgmMIM3AnYDu8Nh7OtLCL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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