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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d555043fa4d77f48f8c6f877c085ee477a5065462fe7441af474cecd58f2019' 
  AND token = 'daTGxAa4FmztHX2yrNKE6bK82R7htCb5XqePlff8Qvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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