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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32be77e781f9aecad0696ac7ec21de778151061a79e5f372991ad82bccacdaa7' 
  AND token = 'qmo4FFN6FfpfzkC/8/e8+FD6m6pXAyRVXXhDS4wSe24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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