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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36784264419edf22e4932f6087dfff6528c98c485e6a7b6d076d3188294cda92' 
  AND token = 'eVhTQB9zoanJyRG/lE6ljD9Qmr0kXxMN59Qoh5cS23I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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