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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f16e2dc89635c3ceb2783ee7fe2eb2c4bfa4757f60d9a1f66045ed51ebc0ef' 
  AND token = '7LRzqyR0v5Z/5fVyDKezcOFti5vP8hkT7cCqWvxz8EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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