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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abc8cfb5d5e6b722ed2d92a068e0a4716bb689f098b00c75917ddb5624840ad' 
  AND token = '3zJnzwaVD+QjiGt9T9rW1MUJw9qbRC5B4pREzHP293E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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