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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99517ac271202e33a52af8505ee7e944633d3d91f2b0c64e376643925036b74f' 
  AND token = 'DiNHf9Iuy8CiIE60JoduBq/TeNmIDh6vrUYG1/8aiRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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