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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f50b7fbca49ebcba3bd45952de6e4408196bb09bcda6d21bdb33eb606025d58' 
  AND token = 'VRKPbw497ipRjIjheox6opWGP/qQ8I+NBeAftKBT6l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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