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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc582fe81c2c6599eb5660303bbfa19f004acc2480d887a427a11f19d770ca51' 
  AND token = 'xyeN7xCYZT0t6kypFz3AlBTxp8Ev7LQkkqdQ/+BKMuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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