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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1c377a47599a2d9fc4245db3b0d91c0f9199be0b65498b69c3a9a86dfdbe5c' 
  AND token = '1MPo9t0VBFm2rP1M5H/2+NRwphu0g3niIbejVv/Qz+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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