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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0036e7bf22a7e35c75ad025169a6b0ba31b891c6eb5fcc4fd8d2bc5351dd0daf' 
  AND token = '+u+NkWqGaCalaiCTwz2YMi0f4tXP+wD5wadKf5/ar4U=' 
  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"
    }
  }
}