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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233a532628252d41e05c1f8d77a4c67b2a901994f2fca5b9a2e41ddbf7bdc9f3' 
  AND token = 'G3V+tJo7kijLyZ2aaoNgDI5Cfbcn7RG2pzsNkV6svLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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