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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fad6239f7ead0293269b5704e08012916c4be40cb35ff3033c03bc3ad23e34' 
  AND token = 'yM69jf/6hX20nwnNNfl33TCjNFp7K8AYuTuDo2L/joE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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