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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656fbf4453239d18a50f53f10febf6f0e3e745ee9ce24f3387495197da15e362' 
  AND token = '6ODPU6ebXZWNySaqDIZ6543/lo8NhxPtZT2p2CrBxRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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