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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fea0835df66295d84c0695237129fe5dea59678a405e9a3d703e37d48188b0c' 
  AND token = 'hz+i4ZOJrnDWEzpcDFBtTzfFcC5hqbsFdtHM4Va9gzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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