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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5770c3e1a96e447f09fb01e00d1c2f562b231870166eb2aa6a219d30da5f511f' 
  AND token = '7TkkqoZDULtPS+/V3/DK7/Rrw8LxgzKu4zfWE86I5cc=' 
  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"
    }
  }
}