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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8582b4dfea18ef530f075d51ce141423d28d6d761f236f271a0b17bbda6d32b6' 
  AND token = 'bwVoVcZ5NiOb8mX/lzJc/+r6vmrgDFs9TmkI6j5FexM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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