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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd55f82888689d38124df0d6f3a17c53c51779a3fb9903c81c2af73c931293a' 
  AND token = 'VnQpsJPMF8zFevclxBrlImG7n1TBJ9WRd4dXKLyzU6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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