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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760a5dde0a5f6cc9b37befca4f1c4a19753e8680abfbc49ab1ea7d68ab3943a7' 
  AND token = '4W+mAMFefb2P698iBIpzByTGvqHF2gXEwOZf+C8QS7k=' 
  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"
    }
  }
}