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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bcd469577869c3124b8452016fdcea0aba07d7975ad5fefe6283ec9ea772b3' 
  AND token = '+9mTeCTY0mU3nyyxzms7vpobPbR0lh7ELKmthxR99+0=' 
  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"
    }
  }
}