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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8063f0ac29285213e08865b0e47162fce0d9a8ae596c9dab0c2c7d70b5adc0' 
  AND token = 'pry/d4j7BcZvXRIlTMRyD74iw9YWt5VMdvsTrXyuZxo=' 
  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"
    }
  }
}