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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a64b9770cade1b0b842712c496c9612cdb86ab237275a799f25f2ff7d97eea' 
  AND token = 'G5cXwGR0K1Zg9weLK73xpoaZUCdg/i1tct/qMU4F/7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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