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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d9dd8a10744e8b6cd2465b0e845c3f9f97732e93a2e804be3dc3367bdfb542' 
  AND token = 'mHrF//b4GZOKsGsX5x3F8MRq8OPTleG5nnR7pT9h+lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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