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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49368fde82330016cc47a6ab4155a47472a2b68cbcce88ae1e914964f840851f' 
  AND token = 'yuprlz4+uFJiuIgEe2P5nz2uQ3NF+e4FG+3ZXcoweio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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