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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6fd58c9bc6fd4d878df0bac60871b1a8f6bc5c58b2c0a6f08493d00ef0b482' 
  AND token = 'OH2W2ThH4XQJpQBhrlV2olOgUp0+kb0++QyPXLBjAc8=' 
  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"
    }
  }
}