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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe16a3c49b75a30669165f0140116935974c499f536365e879ee9b346d1894c5' 
  AND token = 'BW7wnNgrNoL1eQrqmQHNpaB8gIqsLspe8+cS1WUQWoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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