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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf9a4f62e274caa93a2da3e79e47aa973a2f5d93c7c99cd94716fd422cd4eae' 
  AND token = 'vhTP03kt5Q4zWnyLOgxYmz72qvDvcFD1bII0xFa1+fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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