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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e6de491c57c32dd0f27aacb56261a799276a7ac0b51bada2a587462ff747d7' 
  AND token = 'r+mt2F/maXlZM7l6j5j406E2nwhVI6fhit9JVJrg9p8=' 
  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"
    }
  }
}