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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f850564b853235a3436e851f7f7a5fa3cf37fe40f71cb030632f4654d3dbf697' 
  AND token = 'FfpDKaJLF72O341CY8p7XWGEHVZOVX6yku7ErcyRskI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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