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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebbbd1d5c362f7f87776c5e47575f3e2fb6e1ceb8be4714e6042e3e7c4fc71e' 
  AND token = '+MK0gLw9GL+ESD3AFU/9mHYt76927kjJ665W/7Wsauk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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