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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23f62ecb715dc2a98ec119e97299af226eb86b3e2f773f9ebe1cb18577f9736' 
  AND token = 'N3iW0H23YbyP8Ru1dciirs+3Hm9yEWZhaEuTbyZ2rJw=' 
  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"
    }
  }
}