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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff200adb5d8751e04ba39fe8280af0d2b84b6e75b1b2f71903658caa73215bc2' 
  AND token = 'buLUqnfUZqbH55G2H9uHe86vGd789xwI5tisBUsTU8E=' 
  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"
    }
  }
}