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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721cae5441bccbcd771a307a56fb052f311cda7c54f66633718f9e2ebf92d4fe' 
  AND token = 'lfwG9Zo6XDTd+Fimbuir8I9AiTM+oDYq38R3u/RGedo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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