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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1e61d915f7cfa7644c7074eb57a434d789bb91dcfe45808c3cdeb3977e7ec7' 
  AND token = '/ENPsBBTvMXMMFvxjgKbqE6Zfhwe30JfYER/1vXnk0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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