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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe47b3dd0de5d17612566b2cd112ffb2d1bc091ef16115731ed6f0f60c4bd079' 
  AND token = 'lraX+DYMA+Ns3RUrr8P5/1wan/T8P6U/f6/bIn2GyzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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