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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2442237b47d3275fb636d87c52ca54d1069b5a8b4a412a62c46e3483d38d28d4' 
  AND token = 'Mx5IQzqLHhUso6J9t6+6cn6ATxvM1m6SKCtoq14nKLY=' 
  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"
    }
  }
}