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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b4d392d9b927f0adde54358c413f5e12820b9e770d9ccb2cca19fb6b31643e' 
  AND token = 'TBjjA7tIA6BvipyT4eMvXTbA1AeXVLvoBGoB9R/fYO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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