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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83dcd01d081bfe0c3036e1701550ebd7e3286c959da5edaa6b59f442c04a1b8' 
  AND token = 'RG2jTWuI0MSH6RvU/38aHs3B5ixMvkxm2nrvn2LI3+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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