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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d52f979f0a9eb0a17118c1ae65b6e6be9e151d2f00723092e100dbf7c41d01' 
  AND token = 'nxFq3JUVLUmW0yUzwuhJ0YXxPdiG9d71pQMikrp5M6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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