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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a21f0baa4ecb87496ab45bc6688068730a99be162e2a7705f88cc40b3d2fd3' 
  AND token = 'oZm5UZMJ370ktf95VvhFFgYPkcrQ1Kqev9o2iHEW824=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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