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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3c87249bf9738cebbf4a6ee2294a056ade76f27d222c9fc3a7c4d924205322' 
  AND token = 'a7CrpYv9g7TMmh95lShZGdP2sWzu5/YXMkSwgDThtfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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