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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3269b2806c653f8b8a77694458eaa9a78efbcbd913eb6d6cf3734abbc8dad6' 
  AND token = '4JVAa/yC+k8D5QKoaEM9hzw+X7aHb7WM1FJOrqrgYXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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