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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ffcf204c0e080d49cd1d9d3cd0b6072b97e02536f7a15a354f8d4a14d25850' 
  AND token = 'YtI899yqD6yVyjH7exE1D8oH0nSGqwUpISK8ihZx7bk=' 
  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"
    }
  }
}